Check Part L building compliance

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External factors

Metres the dwelling is above sea level.
Type of exposure
The level of shielding or protection a building or a specific system has against external environmental factors such as wind, noise, or outdoor pollutants.
Terrain Type
The type of surrounding landscape or environment. Terrain class helps determine how external conditions, such as wind speed and turbulence, will impact ventilation and airflow around a building.
Noise nuisance
Is there environmental noise from the surrounding area, which can influence whether occupants keep windows closed?